Continuous concrete-mixer.



A. S. OLNEY.

CONTINUOUS CONCRETE MIXER.

APPLIOATION FILED FEB. 20, 1912.

'1 44,807 Patented Nov. 19, 1912.

ALONZO OLNEY, OF BERKELEY, CALIFORNIA.

. ('JON'I!;[NUOUS CON CRETE-MIXER.

Specification of Letters Patent.

Application filed February 20, 1912. Serial No. 678,868. I

To all whom it may concern: Be it known that I, ALoNzo S. OLNEY, a citizen of the United States, residing at Berkeley, in the county of Alameda and State of California, have invented new and useful Improvements in Continuous Con-..

crete-Mixers, specification.

This invention ing apparatus. I

The object of the present invention is to provide a continuous, rotary concrete mixer involving details of construction designed of which the following is a relates to a concrete mixto produce a oementitious mixture,the ingredients of which are thoroughly commingled during transit through the apparatus, and which device is easily operated, readily shiftable and adjustable to the different requirements and may be operated with a minimum expenditure of power.

The invention consists of the parts and the construction'and combination of parts as hereinafter more fully described. and claimed, having reference to the accompanying drawings, in which Figure 1 is a side elevation of the apparatus in partial section, Fig. 2 is a plan view thereof. Fig. 3 is an end view.

In the illustrated embodiment of the invention 2 represents a suitable frame or truck, having a plurality of bearing wheels 3 which may be adjustably connected to the frame 2, as by pivotal adjustments or connections 4, the front of the truck being provided with a tongue or handle 5 by which it may be drawn along the roadway or plat form adjacentto the material to be mixed or moved sidewise along a trench,to be filled. t

JPivoted for tilting on the frame or. truck 2 is a carrier 6 provided with trunnions 7 mounted in suitable bearings 7 on the truck; the upperend of the carrier 6 provided with a spring lock or latch 8' engageable with a stationary rack 9, secured to the adjacent end of the truck 2, so'that the carrier 6-, when adjusted in the desired angular position about its trunnions 7 may be lockedin the latch 8. v

Thepurpose of providing a tiltable carrier 6 with its latching device is to enable a certain adjustment or pitch to be'given to a mixing drum 10 which is rotatable upon rollers 11 journaled on the frame or carrier 6. At a suitable position between the ends being desired position by the.

of the mixing drum to mesh with a driving pinion 13 secured on a shaft 14 running bearings 15. 1 On one end of the pinion shaft 14: is secured a bevel-gear l6 meshing with and driven by a gear 17. The gear 17 is secured on a shaft 18, mounted in appro priate bearings 19, and having at its outer end' a crank or other drivingelement 20 whereby power may be transmitted through the gear 17 to the shaft 14 and through the gear 13 revolve the drum gear 12.

One of the important features of the pres- ,,ent invention is the peculiar structure and design of the mixing drum 10; the latter beingshown in part, as at its uppermost or charging end as of octagonal or other suit- Patented Nov. to, 1912..

10 is gear 12 adapted Y in suitable journals or able shape at 21, this end beingprovided 1 with an lnturned flange 22, into the opening of which projects a concave hopper or feed plate 23 supported by suitable brackets 24 fastened to the drum carrier 6. The length of the octagonal portion 21 of the drum 10 may be as desired. To the inner portion of the octagonal section of the drum is connected a polygonal. section substantially square in cross section, as'at 25, the-square portion tapering gradually from its conjunction with the octa onal portion 21 to the discharge end 26. specific form of mixing drum dry material, such as cement and stone of sultable size, being-fed in from the hopper 23 will discharge into the octagonal portion 21 of the drum and as this is revolving" the dry material will be thoroughly agitated and rmxed before it is' saturated with water whlch 1s y this peculiar'and admitted through a pipe 27 extending inwardly and havmg its inner end perforated,

as at 28, the discharge of water from the perforations 28 occurrmg well withm the feed end of the drum.

Adjacent totheend of the water feed pipe 27 there is securely mounted internally on the mixing drum 10 a continuous barrier or dam structure which is both annular and beveled, as shown at 29, the mwerdly pro-. jecting flange of which is of sufficient. depth to form a dam for the water and material at the lowermost portion vof the mlxmg drum, and as the latter revolves the heavier material including the cement, gravel and stone is carried upwardly by the fiat s1 des of the drum, the water meanwhile rushlng downwardly to maintain a pos1t1on at the lowermost portion of the drum 10. As the material to be mixed is carried upwardly on to be the most advantageous for different certain distance, it

grades of concrete desired.

It will be seen that as the material to be mixed advances through the mixing drum 10 while this is revolving that the progress of the material is checked by the bafiies 29 so that a large portion of the material is carried upwardly and caused to fall from the sides of the drum, when this is revolving, into the water which is normally seeking a devel at the lowermost portion of the drum.

That material which has been carried up wardly and falls is thoroughly saturated with water held behind the dams or barriers 29 and a perfect mixture is insured before the material is discharged from the discharge end 26 of the drum 10.

It is observed that one of the peculiar effects of the annular or endless barriers rojecting inwardly from the inner surface of the rotary drum is that, as the material is carried upwardly b the flat sides to a fall; or drops from the sides athwart the inwardly projecting blades or barriers and is chopped when falling across the edges of the barriers, thus greatly increasing the rapidit with which the water checke gle with the component parts of the cement mixture. It is well known that finely powdered cement has a tendency to form in lumps'which it is difficult to saturate with water, and the tumbling of the fine powdered cement by the peculiar shape. of the drum, causing it to fall across the edges of the barriers, greatlyv facilitates the admixture of the powdered cement with the water. B extending the water feed pipe 27 inward near the upper portion of the drum, t e .water being discharged through the perforations 28 of the pipe, falls a distance equal the diameter, nearly, of the drum, thus striking against the bottom portion of the. drum with suflicient force to wash off such plortion of the material as may adhere to t e inner surface, this being a very considerable factor in increasing the efficiency of the apparatus.

Since this mac ine is designed to mix batches of cementitious material, or to mix the material continuously when fed in regularly, 'and since the material dischargin from the mixin drum ma be preci itate directly into a Form or mo d ormay e disegage pins 34 on the scoop behind the ams can min-' charged into wheelbarrows positioned successively below the discharge end of' the drum, in able to suspend a bracket structure 31 by the pivots 32, so that'during the interim, when there is no Wheelbarrow in position beneath the discharge end of the drum 10, then the scoop 30 may be turned below the edge of the drum to catch the material continuously feeding. When the next wheelbarrow is positioned, the scoop 30 is pivots 32. to discharge its contents into the positioned wheelbarrow, and when notin use the scoop 30 may be tilted upwardly over the upper portion of the discharge end of the drum 10. A suitable pawl 33 fastened to the brackets 31 is adapted to en- 30 to hold it in either of its adjusted positions.

When it is desired to mix a batch or small quantity of able to the lower end of the mixin 10 a cap 35 which has an inwardly 'rected flange 36 with a central opening 37 the flange '36 serving to hold back a batch of material inthe drum when this is revolving, the depth of the flange 36 determining the quantity ofthe materialwhich may be retained and mixed in the cylinder without a continuous discharge. When the batch of material has been thoroughly mixed, as it will be by being carried upwardly on .the flat sides of the drum and tumbled about and thrown across the chopping edges of the barriers 29, which check the downward flow of water so that the material will fall into the small pool of water collected behind the barriers, it is drum 10, which may be tipped about its fulcrum or supporting trunnions 7 into a wheelbarrow or other receptacle.

Having I claim and desire ent is- 1. In a mixing apparatus, the combination-of a mixing drum having polygonal cross section from end to end, continuous bafliesinternally formed in the drum, and adapted to check the advance of material to be mixed throughthe drum, said bafies having sharpened edges adapted to impart a to secure by Letters Pat- ,chopping effect to theinaterial dropping athwart the bafiies,

and means for rotating said drum.

2. A concrete mixing apparatus including a rotary drum having a polygonal portion in which the concrete is mixed in a state and having a polygonal portion of different transverse area in axial line with the dry mixin part, and endless internal barriers space within the drum forming dams to check the flow of material through the drum, said barriers having sharpened the latter case or use it is desirscoop or basin 30 from a cement, there is attachdrum 7 dry;

swung about 1ts-.

then discharged from the thus described my invention what a in'ner edges adapted to impart a chopping eflect to the material dropping athwart said edges.

3. A concrete mixing apparatus including a rotary drum having a polygonal portion in which the concrete is mixed in a dry state and having a polygonal portion of different transverse area in axialline with the dry mixing part, endless internal barriers spaced within the drum forming dams to check the flow of material through the drum, said barriers having sharpened inner edges adapted to impart a chopping effect to the material dropping athwart said edges, and a cap having a smaller discharge aperture than the drum end. r

4. In a concrete mixing machine, the combination of a longitudinally revoluble mixing drum having a polygonal cross section from end to end, means for rotating the drum, means for admitting water to said drum, a tiltable frame upon which the drum is mounted, said drum being provided With continuous bafiles internally formed in the drum to hold the water until absorbed and to facilitate the mixing, said baflies having sharpened edges adapted to impart a chopping effect to the material dropping athwart thereof, and a cap adjustable to the discharge end of the drum.

In testimony whereof I have hereunto set my hand in the presence of two subscribmg witnesses.

ALONZO S. OLNEY. Witnesses:

CHARLES EDELMAN, O. J. Swanson, 

